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    <li class="toc-entry toc-h2"><a href="#overview">概览</a></li>
	<li class="toc-entry toc-h2"><a href="#changing-the-separator">更改分隔符</a></li>
    <li class="toc-entry toc-h2"><a href="#accessibility">无障碍处理</a></li>
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<main class="col-12 col-md-9 col-xl-8 py-md-3 pl-md-5 bd-content" role="main">
  <h1 class="bd-title" id="content">面包屑导航(Breadcrumb)</h1>
  <p class="bd-lead">在通过BootStrap的内置CSS样式，自动添加分隔符、并呈现导航层次和网页结构结构，从而指示当前页面的位置为访客创造优秀用户体验。</p>
   
  <h2 id="overview">概览</h2>
  <p>分隔符号是通过<a href="https://developer.mozilla.org/en-US/docs/Web/CSS/::before"><code class="highlighter-rouge">::before</code></a> 和 <a href="https://developer.mozilla.org/en-US/docs/Web/CSS/content"><code class="highlighter-rouge">content</code></a>两个方法定义添加的。</p>
  <div class="bd-example">
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        <li class="breadcrumb-item active" aria-current="page">Home</li>
      </ol>
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    <nav aria-label="breadcrumb">
      <ol class="breadcrumb">
        <li class="breadcrumb-item"><a href="#">Home</a></li>
        <li class="breadcrumb-item active" aria-current="page">Library</li>
      </ol>
    </nav>
    <nav aria-label="breadcrumb">
      <ol class="breadcrumb">
        <li class="breadcrumb-item"><a href="#">Home</a></li>
        <li class="breadcrumb-item"><a href="#">Library</a></li>
        <li class="breadcrumb-item active" aria-current="page">Data</li>
      </ol>
    </nav>
  </div>
  <div class="highlight">
    <pre><code class="language-html" data-lang="html"><span class="nt">&lt;nav</span> <span class="na">aria-label=</span><span class="s">"breadcrumb"</span><span class="nt">&gt;</span>
  <span class="nt">&lt;ol</span> <span class="na">class=</span><span class="s">"breadcrumb"</span><span class="nt">&gt;</span>
    <span class="nt">&lt;li</span> <span class="na">class=</span><span class="s">"breadcrumb-item active"</span> <span class="na">aria-current=</span><span class="s">"page"</span><span class="nt">&gt;</span>Home<span class="nt">&lt;/li&gt;</span>
  <span class="nt">&lt;/ol&gt;</span>
<span class="nt">&lt;/nav&gt;</span>

<span class="nt">&lt;nav</span> <span class="na">aria-label=</span><span class="s">"breadcrumb"</span><span class="nt">&gt;</span>
  <span class="nt">&lt;ol</span> <span class="na">class=</span><span class="s">"breadcrumb"</span><span class="nt">&gt;</span>
    <span class="nt">&lt;li</span> <span class="na">class=</span><span class="s">"breadcrumb-item"</span><span class="nt">&gt;&lt;a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">&gt;</span>Home<span class="nt">&lt;/a&gt;&lt;/li&gt;</span>
    <span class="nt">&lt;li</span> <span class="na">class=</span><span class="s">"breadcrumb-item active"</span> <span class="na">aria-current=</span><span class="s">"page"</span><span class="nt">&gt;</span>Library<span class="nt">&lt;/li&gt;</span>
  <span class="nt">&lt;/ol&gt;</span>
<span class="nt">&lt;/nav&gt;</span>

<span class="nt">&lt;nav</span> <span class="na">aria-label=</span><span class="s">"breadcrumb"</span><span class="nt">&gt;</span>
  <span class="nt">&lt;ol</span> <span class="na">class=</span><span class="s">"breadcrumb"</span><span class="nt">&gt;</span>
    <span class="nt">&lt;li</span> <span class="na">class=</span><span class="s">"breadcrumb-item"</span><span class="nt">&gt;&lt;a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">&gt;</span>Home<span class="nt">&lt;/a&gt;&lt;/li&gt;</span>
    <span class="nt">&lt;li</span> <span class="na">class=</span><span class="s">"breadcrumb-item"</span><span class="nt">&gt;&lt;a</span> <span class="na">href=</span><span class="s">"#"</span><span class="nt">&gt;</span>Library<span class="nt">&lt;/a&gt;&lt;/li&gt;</span>
    <span class="nt">&lt;li</span> <span class="na">class=</span><span class="s">"breadcrumb-item active"</span> <span class="na">aria-current=</span><span class="s">"page"</span><span class="nt">&gt;</span>Data<span class="nt">&lt;/li&gt;</span>
  <span class="nt">&lt;/ol&gt;</span>
<span class="nt">&lt;/nav&gt;</span></code></pre>
  </div>
  <h2 id="changing-the-separator">更改分隔符</h2>
  <p>分隔符通过<a href="https://developer.mozilla.org/en-US/docs/Web/CSS/::before">::before</a>和自动添加到CSS中<a href="https://developer.mozilla.org/en-US/docs/Web/CSS/content">content</a>。他们可以通过改变来改变$breadcrumb-divider。该报价是需要函数生成围绕一个字符串的报价，所以如果你想>为分隔符，你可以这样做：</p>
  <div class="highlight"><pre><code><span class="nv">$breadcrumb-divider</span><span class="p">:</span> <span class="nf">quote</span><span class="p">(</span><span class="s2">"&gt;"</span><span class="p">);</span>
</code></pre></div>
<p>也可以使用base64嵌入式SVG图标：</p>
<div class="highlight"><pre><code><span class="nv">$breadcrumb-divider</span><span class="p">:</span> <span class="sx">url()</span><span class="p">;</span>
</code></pre></div>
<p>分隔符可以通过设置<code>$breadcrumb-divider</code>为<code>none</code>：</p>
<div class="highlight"><pre><code><span class="nv">$breadcrumb-divider</span><span class="p">:</span> <span class="nb">none</span><span class="p">;</span>
</code></pre></div>
  <h2 id="accessibility">无障碍处理</h2>
  <p>为了为障碍浏览提供方便，针对面包屑这样具备导航功能的模块，建议添加一个有意义的标签即<code class="highlighter-rouge">aria-label="breadcrumb"</code>來描述<code class="highlighter-rouge">&lt;nav&gt;</code>元素，以及使用 <code class="highlighter-rouge">aria-current="page"</code>到这组导航的最后一个项目，以标明当前页面名称（路径）</p>
  <p>更多信息，敬请参阅 <a href="https://www.w3.org/TR/wai-aria-practices/#breadcrumb">WAI-ARIA Authoring Practices for the breadcrumb pattern</a>（面包屑导航的无障碍研究）。</p>
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